# b = "1233"
# a = "asd"
# print(b.isalnum)
# print(a.upper())
# print(a.islower())
# x = "aa#bb#cc"
# r = x.split("#")
# print(r)
# print("*****".join(r))
# print("xy"  in  "x")
# # print("xy"not in "x")
# count = 1
# for i in "xyzabc":
#     for j in "#@":
#         # if count == 6:
#         #     break
#         if j!="@":
#             continue
#         print(f"第{count}次拿取元素:{i}--->{j}")
#         count+=1
# print("abcWDAS".swapcase())
# print("abcxyz".startswith("ab"))
# print("# xyz #".strip("#"))
#
# print("abcWADA".endswith("DA"))
#
# print("welcome to sc".center(50,"%"))
# print("welcome to sc".ljust(50,"%"))
# print("welcome to sc".rjust(50,"%"))
# ============================================================


